Robot payload, reach and repeatability—what the figures really mean.
Published specifications help shortlist robot platforms, but each figure has limits. The complete load, motion path, tool geometry and process tolerance must be checked together.
Payload includes everything moving on the robot wrist.
Add the product, gripper, tool changer, sensors, valves, hoses and cables. The centre of gravity and inertia can make a load unsuitable even when its mass is below the headline payload.
Heavy or offset tooling increases wrist moments. Robot manufacturers provide load diagrams or calculation tools that should be used during application engineering.
- Product and packaging mass
- Gripper and adapter plates
- Tool changer
- Pneumatic and electrical components
- Hoses and cable dress
- Centre of gravity and inertia
Nominal reach is not the same as usable reach.
The robot needs a valid joint configuration at every point, with clearance for the arm, tool, product, guarding and surrounding machinery. Approach and withdrawal paths can be more demanding than the final pick position.
Offline modelling helps identify collisions and singularities, but final design still needs accurate equipment geometry and realistic cable and tool allowances.
- Base-to-target distance
- Vertical and rear working zones
- Tool length and orientation
- Machine opening and fixture clearance
- Joint limits and singularities
- Maintenance and guarding clearance
Repeatability supports consistency but does not guarantee process capability.
Repeatability describes how consistently the robot returns to a programmed position under defined conditions. The finished process also depends on fixture tolerance, product variation, gripper compliance, calibration, temperature and sensor performance.
Cycle time includes all motion, grip and release delays, machine handshakes, inspection and waiting for product. It should be simulated or tested using realistic acceleration and payload.
- Robot repeatability
- Absolute accuracy where relevant
- Fixture and product tolerance
- Vision or calibration needs
- Process dwell and machine time
- Expected rate with the full sequence
Frequently asked questions
These answers provide an initial planning framework. Final requirements are confirmed against the product, process, site and applicable safety obligations.
Does a 10 kg robot carry a 10 kg product?
Not necessarily. The gripper and all wrist-mounted equipment count toward payload, and the load centre and wrist moments must remain within limits.
What does robot reach measure?
Reach usually describes a maximum radial distance from the robot base to a reference point on the wrist. It does not prove that every orientation or path inside that radius is achievable.
What does ±0.05 mm repeatability mean?
It indicates consistent return performance under the manufacturer’s test conditions. It does not mean every finished product dimension or absolute position will be held to that tolerance.
How is robot cell cycle time calculated?
Add product presentation, robot motion, gripping, confirmation, process time, machine handshakes, release and any waiting. The calculation should use the real payload and safe operating speeds.
Continue planning your automation project
Use these pages to compare approaches, define the application and prepare the information needed for a useful feasibility review.
Complete robot cell integration
See how robot, tooling, controls, vision and safety are delivered as one system.
Read more →Robot selection matrix
Compare 20 reference robot and manipulator platforms.
Read more →Discuss your application
Turn the planning information into a project-specific feasibility review.
Read more →Robot cycle-time calculator
Connect robot movement to the required production rate.
Explore →Reach and cycle simulation
Validate geometry, tool orientation and collisions.
Explore →Discuss the production task with an automation engineer.
Send the product details, required output, available space and a photo or short video of the current process. We will review the application and identify the next engineering step.